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| Udvidelse | Filtypeudvikler | Filkategori | Beskrivelse Af Filtype | Software | Softwareudvikler |
|---|---|---|---|---|---|
| .O1 | Open Source | Datafiler | Object File For GO321v1 Platform | Free Pascal | Open Source |
| .OBJ | Wavefront Technologies | 3D-billedfiler | Wavefront 3D Object File | MeshLab | Open Source |
| .OBML | Opera Software | Webfiler | Opera Mini Saved Web Page | MicroEmulator | Open Source |
| .OBML16 | Opera Software | Webfiler | Opera Mini Saved Web Page | MicroEmulator | Open Source |
| .OBS | Department of Wind Energy at the Technical University of Denmark, Denmark | Datafiler | WAsP Obstacle List Data | Open Broadcaster Software | Open Source |
| .OBT | Open Source | Indstillingsfiler | Openbox Theme File | Openbox | Open Source |
| .OCSP | Open Source | Datafiler | HAProxy OCSP Data File | HAProxy | Open Source |
| .OCT | Radiance Community | 3D-billedfiler | Radiance Octree File | RADIANCE | Open Source |
| .ODD | Coby Electronics Corporation | Lydfiler | Coby Voice Recorder Data | TEI Tools | Open Source |
| .ODF | Oracle Corporation | Ikke Almindelige Filer | OpenDocument Formula | AbiWord | Open Source |
| .ODM | Open Source | Tekstfiler | OpenDocument Master Document | AbiWord | Open Source |
| .ODR | Open Source | Datafiler | OpenIV Model Data | OpenIV | Open Source |
| .ODT | Oracle Corporation | Tekstfiler | OpenDocument Text Document | AbiWord | Open Source |
| .OEB | IDPF (International Digital Publishing Forum) | eBogsfiler | Open eBook File | Calibre | Open Source |
| .OEM | Microsoft Corporation | Indstillingsfiler | Original Equipment Manufacturer Setup File | OEM Information Editor | Open Source |
| .OFF | Open Source | 3D-billedfiler | Object File Format | MeshLab | Open Source |
| .OFX | Intuit, Inc. | Datafiler | Open Financial Exchange File | GnuCash | Open Source |
| .OGA | Xiph.Org | Lydfiler | Ogg Vorbis Audio File | IrfanView | Open Source |
| .OGG | Xiph.Org | Lydfiler | Ogg Vorbis Audio File | IrfanView | Open Source |
| .OGX | Xiph.Org | Videofiler | Ogg Vorbis Multiplexed Media File | XMMS | Open Source |
| .OIV | Open Source | Plug-in-filer | OpenIV Mod Package File | OpenIV | Open Source |
| .OKT | Open Source | Lydfiler | Oktalyzer Module | ModPlug Player | Open Source |
| .OMO | Open Source | Udviklerfiler | OMake Object File | OMake | Open Source |
| .OO | Open Source | Ikke Almindelige Filer | Free Pascal Object File For OS/2 Version | Free Pascal | Open Source |
| .OOA | Sublime HQ Pty Ltd | Datafiler | OOA Interchange Format Data | PSPad | Open Source |
| .OP | Open Source | Datafiler | OpenPAT Report | OpenPAT | Open Source |
| .OPML | The Omni Group | Webfiler | Outline Processor Markup Language File | OPML Editor | Open Source |
| .OPT | LexisNexis | Databasefiler | Concordance Database File | AGiliTy | Open Source |
| .OPUS | Open Source | Lydfiler | Opus Audio File | MediaInfo Player | Open Source |
| .OS | Open Source | Udviklerfiler | ObjectScript Source File | ObjectDevel | Open Source |
| .OSC | OpenStreetMap | GIS-filer | OpenStreetMap Change File | osmchange | Open Source |
| .OSZ | Ppy Pty Ltd | Spilfiler | Osu! Beatmap File | opsu! | Open Source |
| .OTD | Open Source | Spilfiler | OpenIV Texture Data | OpenIV | Open Source |
| .OTF | Open Source | Skrifttypefiler | OpenType Font | FontForge | Open Source |
| .OTRKEY | OnlineTvRecorder.com (OTR) | Videofiler | OnlineTvRecorder Encoded Video File | otrtool | Open Source |
| .OUT | Open Source | Eksekverbare filer | Compiled Executable File | Linux | Open Source |
| .OW | Open Source | Udviklerfiler | Free Pascal 1.0.x Object File | Free Pascal | Open Source |
| .OX | Open Source | Udviklerfiler | Ox Source Code | OX Professional | Open Source |
| .OXO | Open Source | Indstillingsfiler | Ox Object-oriented Matrix Programming Language Source Code | OX Professional | Open Source |
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